step feed drill attachment 分级进给钻削附件
drill unit with fertilizer attachment 带施肥装置的条播机
drill l attachment 钻床配件
Drill and bolt the stringer attachment plate to the long member.
操练和闩上纵梁附件板材对长的成员。
Drill two tunnels at the PCL attachment point inside the thighbone, intersecting with the reconstructed 1igament from the two tunnels behind the shank, fixing the free end using the absorb bolt.
于股骨内髁PCL附着点处分别钻取前后两隧道，与胫后内外两隧道引出的重建韧带形成交叉，游离端使用可吸收螺钉固定。
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